Chemistry question and answers for July 09, 2023
- Q How does anaerobic metabolism play a role in poor oralhealth?
- Q What kind of interaction can threonine and asparagine form?Would this interaction be likely to form on the surface of aprotein? Why or why not? What role does this interaction play...
- Q The vitamin form of Vitamin B6 is pyridoxine (Figure 2). In thebody, pyridoxine is converted to active PLP. What important roledoes PLP play in the body?
- Q Explain why it is important for a microorganism to rapidlyacquire information about its environment with respect to time.What role does Brownian motion play in this process?
- Q Q 1: If the fluorescence signalfrom a PMT is 0.531 volts, what will the voltage output be if thefollowing occurs:a. the lamp intensity doublesb. the concentration is reduced by 1/2c....
- Q Calculate ΔG∘rxn and E∘cell for a redoxreaction with n = 3 that has an equilibrium constant ofK = 5.3×10−2.ΔG∘rxn =E∘cell =
- Q In capillary gel electrochromatography. a) what is the source ofsolute movement through the capillary? b) what drawbacks does thistechnique have? c) what are the advantages of this technique?Please provide reference
- Q An acetic acid-sodium acetate buffer can be prepared by addingsodium acetate to HCl(aq).a) Write an equation for the reaction that occurs when sodiumacetate is added to HCl(aq)b) If 10.0g of...
- Q Focusing techniques a) describe isoelectric focusing andisopycnic (density) separation techniques b) why are these realfocusing techniques? c) how are these gradients established in bothcases? d) describe the difficulties in using...
- Q Use the enthalpies of formation in the table below to answer thefollowing questions.SubstanceEnthalpy of Formation (kJ/mol), 298 KOxygen (O2)(g)0Methane (CH4)(g)-74.8Carbon Dioxide (CO2)(g)-393.5Water (H2O)(g)-241.8Water (H2O)(l)-285.8A) Calculate the change in enthalpy for...
- Q In open tube CE a) How does chiral analysis work and with whatadditives? b) explain with detail why use coated capillaries? c)explain with detail why open tube CE shows high...
- Q Gradient conditions and methods development a) why is methoddevelopment easier with gradient elution chromatography thanisocratic separations? b) in some detail explain why one would useelevated temperatures in liquid chromatography? c)...
- Q Describe some ways that the Emergency Response Guidebook is usedwhen responding to incidents involved the release of hazardousmaterials.
- Q Combining Equilibrium Constants.It is possible to predict the equilibrium constant of a reactionby combining two or more reactions for which the value ofK is known. When combining equilibrium constants, it...
- Q Calculating Equilibrium ConcentrationsPart ACarbonyl fluoride, COF2, is an important intermediate used inthe production of fluorine-containing compounds. For instance, itis used to make the refrigerant carbon tetrafluoride, CF4 via thereaction2COF2(g)⇌CO2(g)+CF4(g),    Kc=7.10If only...
- Q At 1 atm, how much energy is required to heat 53.0 g of H2O(s)at –22.0 °C to H2O(g) at 157.0 °C? Helpful constants can be foundhere.
- Q For your indicator, what is the wavelength of maximum absorbancefor the pH < 4.00 solution? What is the wavelength of maximumabsorbance for the pH > 10.00 solution? What colors correspondto...
- Q What is a spontaneous change? What role does kineticsplay in determining the apparent spontaneity of a chemicalreaction? Select all that apply.A spontaneous change occurs by itself, without continuedoutside assistance.Kinetics plays...
- Q Explain how the percentages just given show that the methylgroup exerts an ortho–para directive effect by considering thepercentages that would be obtained if the methyl group had noeffect on the...
- Q Sodium carbonate (2.4134 g) is dissolved in enough deionizedwater to give a solution with a total volume of 250.0 mL. What isthe pH of the resulting solution? Hint: For carbonic...
- Q Â Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.170 M HClO(aq) with 0.170 M KOH(aq). The ionization constant for HClO can be...
- Q What is a slip system and what role does it play in plastic deformation?Â
- Q Butanone, when treated with methyl magnesium bromide and thendilute aqueous acid, yields 2-methyl-2-butanol.a) Please explain how Grignard reagents work. For example, whatrole does the magnesium play, and why is carbon...
- Q A sample of Freon-12 (CF2Cl2) occupies 10.0 L at 368 K and155.60 kPa. Find its volume at STP.
- Q draw a mechanism that explains how the nitro-substitutedaromatic products observed in your reaction were formed
- Q A certain weak base has a Kb of 7.40 × 10-7. What concentrationof this base will produce a pH of 10.17?__?__ M
- Q At 1 atm, how much energy is required to heat 49.0 g of H2O(s)at –22.0 °C to H2O(g) at 127.0 °C?
- Q 4. In terms of intermolecular interactions, try to account forthe differences in melting point between salicylic acid (mp158.6°C) and acetanilide (mp 114.3°C).5. Isobutyric acid has a solubility in water (at...
- Q determine the number of formula units ofa) CaF2 in a unit cell of fluoriteb) TiO2 in a unit cell of rutilec) unit cell of a diamond**** please explain how to...
- Q For a particular reaction at 129.9 °C, ΔG = -603.84 kJ/mol, andΔS = 313.84 J/(mol·K).Calculate ΔG for this reaction at -3.4°C.
- Q Calculate the change in pH when 64.00 mL of a 0.575 M solutionof NaOH is added to 1.00 L of a solution that is 1.00 M in sodiumacetate and 1.00...
- Q Calculate the pH of 100.0 mL of a buffer that is 0.060 M NH4Cland 0.185 M NH3 after the addition of 1.00 mL of 5.00 M HNO3.
- Q a) In the decarboxylative elimination, two different solventsare used, butanone and water. What types of solvents are these andwhy is that important for the ultimate course of reaction in eachcase?...
- Q The pKa values of acetone and 1-phenyl-2-propanone are 26.5 and19.8 respectively. Use electronic factors to explain this order ofvalues.
- Q Using the appropriate Ksp values, find the concentration of NO3−ions in the solution at equilibrium after 700 mL of 0.35 M aqueousCu(NO3)2 solution has been mixed with 350 mL of...
- Q Calculate the pH of a buffer solution that contains 0.71 MNaH2PO4 and 0.12MNa2HPO4.I got the answer to the first part which is 6.44, I needhelp with the second partCalculate the...
- Q Discuss your observations regarding the acid/base chemistry ofthe Mn(IV) dimer, including stoichiometry, reversibility, andtemperature effects.Protonation of[MnIV(salpn)(µ-O)]2omplex gets protonated? Where else couldyou have protonated the complex• Dissolve 0.1 mmol (70 mg)...
- Q Calculate the change in ph when 0.24 mol H+ is added to 1.00 Lof each of the following buffers:a) a 0.58 M solution of pyridine (py) containing 0.52 M pyH+b)...
- Q 1 5 mL of 3% H2O2 & 10 mL of 0.60M KI5 mL of 3% H2O2 & 10 mL of 0.30M KI5 mL of 2.25% H2O2 & 10 mL of...
- Q If an ion fragments in the drift tube of a TOF, how would youknow? Keyboard Shortcuts
- Q Air at 480Kpa is expanded adiabatically to a pressure of 94Kpa.It is then heated at constant volume until it again attains itstemperature, when the pressure is found to be 150KPa....
- Q A breathalyzer measures volume % ethanol in gases exhaled fromthe lungs. Calibration relates it to volume % ethanol in thebloodstream. Use VLE concepts to develop an approximate relationbetween the two...
- Q In ftir why does collecting more data point in the time domainimproves the resolution in the frequency? I know it is because ofthe longer mirror movement distance but why
- Q It is desired to compress ethylene gas [MW = 28, k = 1.3, cp =0.357 Btu/(lbm-°F)] from 1 atm and 80°F to 10,000 psia. Assumingideal gas behavior, calculate the compression...
- Q The reversible hydrolysis of ethyl acetate to ethanol and aceticacid has an activation energy of 1 kJ/mol and a pre-exponentialfactor of 1.5*10-2 Mxsecy .Thereaction is proceeding at 98.6oF.The density of...
- Q Calculate the [H ] and pH of a 0.000501 M hydrofluoric acidsolution. Keep in mind that the Ka of hydrofluoric acid is 6.80 ×10-5.
- Q What is the difference in ion source conditions for a MALDIgenerated ion versus an ion introduced by orthogonal extraction?Keyboard Shortcuts
- Q 1) Calculate the change in pH when 49.0 mL of a 0.780 Msolution of NaOH is added to 1.00 L of a solution that is 1.00M in sodium acetate and...
- Q In your purification of GAPDH, during the secondammonium sulfate precipitation step, you notice thatyour resuspended pellet does not have activity. You retrace yoursteps and see that there is activity in...
- Q Consider an element that reaches its first excited state byabsorption of 384.4 nm light.a) Determine the energy difference (kJ/mol) between the groundstate and the first excited state.b) If the degeneracies...
- Q 1. Use the data given in the table below to construct atemperature-composition diagram for cyclohexane toluene mixture(see p. 134 in the textbook for an example of such plot). Based onyour...
- Q I can't seem to figure out what the hybridization of PF6(-) is.could someone explain how to find it correctly for me?
- Q Suggest four ways in which the concentration of PH3 could beincreased in an equilibrium described by the following equation: P4(g) + 6H2 (g) ⇌ 4PH3 (g) ΔH = 110.5 kJ
- Q Octane is burned completely with theoretical air in asteady-flow process at a constant pressure of 100 kPa. The productsof combustion are cooled to 25 C. Calculate the number of kg...
- Q There are four organic acids below. Compare the acidities offour compounds and explain.1. benzoic acid2. 4-nitrophenol3. 3-nitrophenol4. 4-Methoxyphenol
- Q A beaker with 1.00×102 mL of an acetic acid buffer with a pH of5.000 is sitting on a benchtop. The total molarity of acid andconjugate base in this buffer is...
- Q For this presentation, draw out the complete synthesis formorphine sulfate to heroin.
- Q Derive the following statement\"T(temperatue)-V(volume) and P(pressure)-V(volume) relationshipin the adiabatic changes\"
- Q Find the weight of P in 1.5254g and 1.5936g ofMgNH4PO4
- Q Most wittig reactions are not stereoselective and yield amixture of cis and trans products. can you think of a reason whythis particular witting shows such a high degree ofstereospecificity. which...
- Q A certain liquid has a vapor pressure of 92.0 Torr at 23.0 °Cand 378.0 Torr at 45.0 °C. Calculate the value of ΔH°vap for thisliquid.   Calculate the normal boiling point...
- Q 2.Calculate [H3O+]total, [OH-]total, [H3O+]water, [OH-]water, thepH and the pOH for a 3.2 x10-2 M aqueous solution of perchloric acid, HClO4.Compare your value for [H3O+]water in the perchloric acidsolution with the...
- Q metal carbonates decompose to form metal oxides with theevolution o CO2. Design an experiment to determine the percentagecomposition by mass of an unkown mixtre using this type ofreaction.
- Q ENERGY STRATEGYHow the expanded use of biofuels,in place of fossilfuel, was thought in theory to be able to slow the buildup ofgreenhouses gases in the atmosphere.Briefly describe two unexpected results...
- Q 4) The reaction below takes place until the solution went fromyellow to clear. If iodine was the contributor to the yellow color,how many moles of I2(aq) are present after completion?...
- Q An equation of state is used to represent the PVTbehavior of both liquids and vapors in a wide range of temperaturesand pressures. Provide an equation of state decision tree anddiscuss...
- Q Use Drago-Wayland parameters to determine to determine enthalpychange for the following reaction:F3BP(CH3)3 +(CH3)3NSO2 ->F3BN(CH3)3+(CH3)3PSO2For N(CH3)3, C=23.6 E=1.65 (you can useHess's law)
- Q A) What is the solubility of M(OH)2 in pure water? B)What is thesolubility of M(OH)2 in a 0.202 M solution of M(NO3)2? The genericmetal hydroxide M(OH)2 has Ksp = 7.45×10−18.
- Q a. Describe the preparation of 2 liters of 0.1 MGlutamate buffer, pH 10.0. You have available monosodium glutamate(MW=169), 0.5M NaOH and distilled water. Use pka of glutamate9.67.b. Momentarily distracted by...
- Q Find the pH of a 0.0106 M solution of hypochlorousacid. (The value of Ka for hypochlorous acid is2.9×10−8.)Express your answer using two decimal places.
- Q Find the percent ionization of a 0.100 M solution of a weakmonoprotic acid having Ka= 1.2×10−3.Express your answer using two significant figures.
- Q The equilibrium constant KC for the reaction below has a valueof 2.80 x 10^2 at a certain temperature. Suppose that for aparticular system at equilibrium at that certain temperature theSO2...
- Q Answer the questions completely with complete calculations.1. what is the oxidation number of elements in BrO2-, BrO3-& BrO4-, Br2, Br-?2. In the reaction 4 NH3 (g) + 5 O2 (g)...
- Q Answer the questions completely with complete calculations.1. How many grams of a sample of NaNO3 should be dissolved in a150.0 mL of water to give a 0.22 M solution?2. A...
- Q how does charcoal differ from graphene in its atomicstructure?
Get Answers to Unlimited Questions
Join us to gain access to millions of questions and expert answers. Enjoy exclusive benefits tailored just for you!
Membership Benefits:
- Unlimited Question Access with detailed Answers
- Zin AI - 3 Million Words
- 10 Dall-E 3 Images
- 20 Plot Generations
- Conversation with Dialogue Memory
- No Ads, Ever!
- Access to Our Best AI Platform: Flex AI - Your personal assistant for all your inquiries!